Friction pile



FIG. 1 is a front view of a friction pile showing my new design.

FIG. 2 is a rear view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof.

FIG. 7 is an enlarged partial top perspective view of area 7-7 of FIG. 1; and,

FIG. 8 is an enlarged bottom perspective view of area 8-8 of FIG. 1.

The friction pile is shown in FIGS. 1-4 with a break line to indicate non-specified length. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a friction pile, as shown and described. 